eth2util: fix fork version

[dB2510]

Fix holesky genesis fork version.

Cherry-pick: #2600

category: bug
ticket: none

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (4c90ca0) 53.76% compared to head (866f92c) 53.76%.
Report is 4 commits behind head on main-v0.17.

Additional details and impacted files

@@              Coverage Diff               @@
##           main-v0.17    #2629      +/-   ##
==============================================
- Coverage       53.76%   53.76%   -0.01%     
==============================================
  Files             198      198              
  Lines           26931    26946      +15     
==============================================
+ Hits            14480    14488       +8     
- Misses          10650    10652       +2     
- Partials         1801     1806       +5     

Files	Coverage Δ
cmd/createdkg.go	72.58% <100.00%> (ø)
eth2util/network.go	67.39% <ø> (ø)
cmd/createcluster.go	59.82% <0.00%> (ø)
cmd/combine/combine.go	66.10% <0.00%> (-1.14%)	⬇️
eth2util/keystore/keystore.go	66.94% <75.00%> (+2.79%)	⬆️

... and 13 files with indirect coverage changes

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